CN110570985B

CN110570985B - Superconducting cable manufacturing method

Info

Publication number: CN110570985B
Application number: CN201910906080.XA
Authority: CN
Inventors: 胡子珩; 吴小辰; 章彬; 汪桢子; 汪伟; 王哲; 魏前虎; 陈腾彪
Original assignee: Shenzhen Power Supply Bureau Co Ltd
Current assignee: Shenzhen Power Supply Bureau Co Ltd
Priority date: 2019-09-24
Filing date: 2019-09-24
Publication date: 2021-06-11
Anticipated expiration: 2039-09-24
Also published as: CN110570985A

Abstract

The present application relates to a superconducting cable manufacturing method. The superconducting cable manufacturing method includes: preparing a current conductor and transferring the current conductor to a plate. And (4) rolling the plate to obtain the tubular plate. And welding the tubular plate to obtain the superconducting cable. According to the manufacturing method of the superconducting cable, the electrified conductor is transferred to the plate, the plate rolling processing is carried out on the plate, the step that the electrified conductor needs to be transferred to the low-temperature Dewar pipe through dragging in the manufacturing process of the superconducting cable can be avoided, and the abrasion of the electrified conductor caused by friction between the electrified conductor and the low-temperature Dewar pipe is avoided. Therefore, the method for manufacturing the superconducting cable can prevent the abrasion of the superconducting cable and prolong the service life of the superconducting cable.

Description

Superconducting cable manufacturing method

Technical Field

The application relates to the technical field of power transmission, in particular to a manufacturing method of a superconducting cable.

Background

In the process of manufacturing a superconducting cable, a current-carrying conductor and a low-temperature dewar pipe are generally manufactured respectively, and then the current-carrying conductor is pulled into the low-temperature dewar pipe in a dragging manner.

However, in the process of dragging the electrified conductor, friction is generated between the electrified conductor and the low-temperature dewar pipe, so that the electrified conductor is abraded, and the service life of the superconducting cable is shortened.

Disclosure of Invention

In view of this, it is necessary to provide a method for manufacturing a superconducting cable, which addresses the problem of abrasion of the current-carrying conductor during the assembly of the superconducting cable.

The present application provides a superconducting cable manufacturing method, including:

preparing a current conductor, and transferring the current conductor to a plate;

carrying out plate rolling treatment on the plate to obtain a tubular plate;

and welding the tubular plate to obtain the superconducting cable.

In one embodiment, the welding the tubular plate to obtain the superconducting cable includes:

welding the tubular plate to obtain the welded tubular plate;

and extruding the welded tubular plate to obtain the superconducting cable.

In one embodiment, after said welding said tubular plate material to obtain said welded tubular plate material, the method comprises:

carrying out nondestructive testing on the welding seam of the welded tubular plate;

if the detection is qualified, performing wave extrusion on the welded tubular plate;

and if the detection is not qualified, returning to the step of welding the tubular plate.

In one embodiment, the non-destructive testing is eddy current testing.

In one embodiment, the wave extrusion of the welded tubular plate to obtain the superconducting cable includes:

extruding waves to the welded tubular plate to obtain an inner corrugated pipe;

laying a heat insulation layer on the outer surface of the inner corrugated pipe to obtain a heat insulation inner corrugated pipe;

sleeving an outer corrugated pipe on the heat-insulation inner corrugated pipe to obtain a low-temperature Dewar pipe;

and sealing a containing cavity formed between the inner corrugated pipe and the outer corrugated pipe of the low-temperature Dewar pipe, and vacuumizing the containing cavity to obtain the superconducting cable.

In one embodiment, after the vacuum-pumping process is performed on the accommodating cavity, the method includes:

and filling liquid nitrogen into the low-temperature Dewar pipe.

In one embodiment, before the outer bellows is sleeved on the heat insulation inner bellows, the method further comprises the following steps: preparing the outer corrugated pipe.

In one embodiment, said preparing said current conductor and transferring said current conductor to said sheet material comprises:

preparing a flexible framework, and sequentially forming a first insulating layer, a superconducting layer, a second insulating layer, a shielding layer and a protective layer on the outer side of the flexible framework to obtain the electrified conductor;

and transferring the electrified conductor to the plate material by adopting a conveying mode.

In one embodiment, the flexible backbone is a metal bellows.

In one embodiment, the welding process is initiated after a preset time has elapsed since the roll bending process was initiated.

In one embodiment, the rolling speed of the plate rolling process on the plate is greater than or equal to the welding speed of the tubular plate.

According to the manufacturing method of the superconducting cable, the electrified conductor is transferred to the plate, the plate rolling processing is carried out on the plate, the step that the electrified conductor needs to be transferred to the low-temperature Dewar pipe through dragging in the manufacturing process of the superconducting cable can be avoided, and the abrasion of the electrified conductor caused by friction between the electrified conductor and the low-temperature Dewar pipe is avoided. Therefore, the method for manufacturing the superconducting cable can prevent the abrasion of the superconducting cable and prolong the service life of the superconducting cable.

Drawings

Fig. 1 is a flowchart of a method for manufacturing a superconducting cable according to an embodiment of the present application.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and those skilled in the art will be able to make similar modifications without departing from the spirit of the application and it is therefore not intended to be limited to the embodiments disclosed below.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Referring to fig. 1, the present application provides a method of manufacturing a superconducting cable, including: and step S100, preparing an electrified conductor, and transferring the electrified conductor to a plate. And step S200, performing plate rolling treatment on the plate to obtain a tubular plate. And step S300, welding the tubular plate to obtain the superconducting cable.

In step S100, the current-carrying conductor is a part of the superconducting cable carrying current, and a plurality of superconducting tapes are generally connected in parallel and wound into a one-phase or multi-phase conductive path according to preset winding parameters. The electrified conductor presents zero potential and even zero magnetic field to the outside. The electrified conductor is placed in a low-temperature environment as a whole, is in a superconducting state under normal operating conditions, can safely pass rated current for a long time, and has certain capacity of resisting impulse current.

The superconducting cable manufacturing method provided by the application can be used for manufacturing a three-phase coaxial cable. In the three-phase coaxial cable, the three-phase superconductor is wound on the framework in a coaxial mode in sequence, and from inside to outside, each functional layer is as follows in sequence: the flexible framework, an insulating layer, an A-phase superconducting layer, an insulating layer, a B-phase superconducting layer, an insulating layer, a C-phase superconducting layer, an insulating layer and a shielding layer. In one embodiment, the flexible backbone is a metal bellows. The insulating layer can be formed by winding insulating materials such as polypropylene laminated paper and the like, and the shielding layer can be formed by connecting superconducting materials or copper materials in parallel. A semiconductor layer can be wound between the insulating layer and the conductor layer, and the semiconductor layer can be used for treating local electric field distortion caused by conductor property irregularity. A thin insulating layer and a protective layer can be wound outside the shielding layer, and the protective layer can be used for preventing the electrified conductor from being damaged mechanically when penetrating into the low-temperature Dewar pipe.

It will be appreciated that the manufacture of the energized conductors may be accomplished using automated multi-ribbon cabling equipment. The cabling equipment can wind a layer of superconducting tape at a time. Meanwhile, the cabling equipment can control and adjust the technical and technological parameters of the tension, the winding angle, the gap and the like of each layer of superconducting tape. And the insulating layer in the electrified conductor can be wound by adopting insulating wrapping equipment. The insulating wrapping equipment can wrap 3-5 layers of insulating paper simultaneously, and can control technical and technological parameters of the insulating paper such as wrapping tension, wrapping percentage, wrapping angle and the like. The other functional layers of the current conductor can be formed according to known methods.

For a three-phase coaxial superconducting cable, multiple materials are continuously wound on the same shaft to form the three-phase coaxial superconducting cable, and each functional layer needs to be wound independently or cooperatively, namely a semi-finished product of a current-carrying conductor in the superconducting cable can repeatedly pass through cabling equipment, insulating winding equipment or other equipment. It should be noted that, since the superconductivity of the superconducting tape may be affected by mechanical stress, in the process of implementing the cable winding process, the tension of the superconducting tape and the insulating paper winding needs to be strictly controlled, and at the same time, the current conductor of the superconducting cable needs to be strictly mechanically protected.

In step S200, the sheet material is rolled to obtain a tubular sheet material. It is understood that a stainless steel plate may be selected as a plate material to be subjected to a rolling process in order to accommodate the operating temperature and the ambient temperature of the superconducting cable. The plate rolling process can be completed by adopting a plate rolling machine. It is understood that the plate bending machine is a processing device for bending and forming a plate material by using working rolls, and can form parts with different shapes such as a cylindrical part, a conical part and the like. The plate bending machine can move the working roll through the action of external force such as hydraulic pressure or mechanical force and the like, so that the plate is bent or rolled and formed. Meanwhile, according to the rotary motion and the position change of the working roller, the plate can be processed, so that the tubular plate is obtained. In one embodiment, the tubular plate may be a cylindrical structure having an inner diameter larger than an outer diameter of the current conductor and may contain sufficient liquid nitrogen to allow the current conductor to operate in a liquid nitrogen warm zone.

In step S300, the tubular plate material is welded to obtain a superconducting cable. In this embodiment, the welding of the tubular plate material may be performed by a continuous welding process. The speed of welding the tubular plate can be the same as the speed of rolling the plate by the plate rolling machine. In addition, the welding of the tubular plate can be carried out after a preset time is delayed after the rolling is started. It is understood that the present application is not limited to the specific manner of welding, as long as it can complete the welding of the plate material. In one embodiment, a strip of steel may be disposed between two ends of the plate to be welded, and a dimension of the strip of steel in a radial direction may be greater than a distance between two ends of the steel plate, so that reliability of welding the two ends of the tubular plate may be improved.

In one embodiment, welding the tubular plate to obtain the superconducting cable includes: and welding the tubular plate to obtain the welded tubular plate. And extruding the welded tubular plate to obtain the superconducting cable. It will be appreciated that the corrugated pipe may be obtained by corrugating a welded tubular sheet. The elastic characteristic of the corrugated pipe profile determines that the corrugated pipe has good flexibility and fatigue resistance, so that the corrugated pipe can absorb various motion deformation and cyclic load and can compensate large displacement. In addition, the effective telescopic deformation of the corrugated pipe can be utilized to absorb the size change caused by expansion with heat and contraction with cold and the like, and the axial, transverse and angular displacement can be compensated, and noise and vibration reduction can be carried out.

In one embodiment, after welding the tubular plate material to obtain a welded tubular plate material, the method comprises: and carrying out nondestructive testing on the welding seam of the welded tubular plate. And if the detection is qualified, performing wave extrusion on the welded tubular plate. And if the detection is not qualified, returning to the step of welding the tubular plate. It will be appreciated that the reliability and effectiveness of cryogenic dewar tubes, which are mostly oriented parallel to the long axis and located inside the corrugations of the cryogenic dewar near the weld, are critical to the superconducting cable. Therefore, in the welding process of the low-temperature Dewar pipe, the welding quality detection can ensure the reliable operation of the low-temperature Dewar pipe. In one embodiment, the non-destructive testing is eddy current testing. Eddy current inspection techniques mainly employ electromagnetic fields to detect defects on the surface and subsurface of a metallic article. Eddy current inspection is non-contact inspection, which can realize rapid inspection in a high temperature environment.

In one embodiment, the method of extruding the welded tubular plate to obtain the superconducting cable includes: and extruding waves to the welded tubular plate to obtain the inner corrugated pipe. And laying a heat insulation layer on the outer surface of the inner corrugated pipe to obtain the heat insulation inner corrugated pipe. And sleeving the outer corrugated pipe on the heat-insulation inner corrugated pipe to obtain the low-temperature Dewar pipe. And sealing a containing cavity formed between the inner corrugated pipe and the outer corrugated pipe of the low-temperature Dewar pipe, and vacuumizing the containing cavity to obtain the superconducting cable. It can be understood that the inner diameter of the low temperature dewar pipe is sized to be suitable for the installation and integration of the superconducting cable body, and the diameters of the inner corrugated pipe and the outer corrugated pipe have a good fitting relationship, thereby facilitating the installation and integration of the heat insulating material. In addition, the low-temperature Dewar pipe obtained in the above steps can be bent and wound on a special cable reel for transportation, and meanwhile, the integration, installation and disassembly of the superconducting cable body, the terminal, external equipment and the like are facilitated. It can be understood that the surface of the outer pipe of the corrugated pipe can be coated with a stainless steel wire mesh sleeve for improving the mechanical strength of the low-temperature dewar pipe.

In one embodiment, the inner corrugated tube and the outer corrugated tube are corrugated tubes, and the corrugated tubes mainly absorb the changes of the sizes of the tubes and/or equipment caused by thermal expansion and contraction and the like. The inner corrugated pipe and the outer corrugated pipe have certain flexibility, and can be laid in a bending mode. In one embodiment, the shape of the corrugations in the inner corrugated tube and the outer corrugated tube may be any one of U-shaped, C-shaped, Ω -shaped, S-shaped, square-shaped, and the like.

In one embodiment, after the vacuum-pumping process is performed on the accommodating cavity, the method includes: and (4) filling liquid nitrogen into the low-temperature Dewar tube. When the inner corrugated pipe is filled with low-temperature refrigerating working medium liquid nitrogen, the working temperature is in a liquid nitrogen temperature region, namely 63-77K. The natural environment outside the outer corrugated pipe is 300K, the vacuum multilayer heat insulation is arranged between the outside of the inner corrugated pipe and the inside of the outer corrugated pipe, and the temperature is the gradual transition of the two temperatures. Therefore, the inner corrugated pipe and the outer corrugated pipe can be formed by selectively rolling the stainless steel plate covering the working temperature zone of the high-temperature superconducting cable, and the ductility and the mechanical strength of the low-temperature Dewar pipe can be increased.

In one embodiment, before the outer bellows is sleeved on the heat insulation inner bellows, the heat insulation inner bellows further comprises: and preparing an outer corrugated pipe. It will be appreciated that the outer bellows can transfer the insulated inner bellows to the sheet and roll and squeeze the sheet to form the waves.

In one embodiment, preparing an electrical conductor and transferring the electrical conductor to a sheet material comprises: and preparing a flexible framework, and sequentially forming a first insulating layer, a superconducting layer, a second insulating layer, a shielding layer and a protective layer on the outer side of the flexible framework to obtain the electrified conductor. And transferring the electrified conductor to the plate by adopting a transmission mode. It will be appreciated that the flexible backbone may be a tubular structure. Firstly, a first insulating layer is wound on the outer surface of the flexible framework, and a superconducting layer is wound on the surface, far away from the flexible framework, of the first insulating layer. When the three-phase coaxial cable is prepared, three-phase superconducting tapes can be sequentially and spirally wound on the surface of the first insulating layer far away from the flexible framework, and a second insulating layer and a third insulating layer are respectively wound between the adjacent superconducting tapes. After the winding of the superconducting layer is completed, a fourth insulating layer is wound on one side, away from the first insulating layer, of the superconducting layer, and a copper shielding layer and a protective layer are sequentially wound on one side, away from the superconducting layer, of the fourth insulating layer, so that the preparation of the electrified conductor is completed.

In one embodiment, the welding process is initiated after a preset time has elapsed since the roll bending process was initiated. It can be understood that after the coil plate processing procedure is started for the preset time, the welding procedure is started again to ensure the welding quality of the tubular plate, so that the failure of welding the tubular plate caused by the coil plate not being in place is avoided.

In one embodiment, the rolling speed of the plate rolling process is greater than or equal to the welding speed of the tubular plate. It can be understood that the rolling speed is a speed of the tubular plate obtained by rolling the plate in a unit time. The welding speed is the length of the welded seam per unit time. In one embodiment, the welding speed may be the same as the plate rolling speed, and the welding is performed on the tubular plate after the plate rolling is started and the preset time is delayed. It can be understood that the same welding speed as the winding speed can improve the manufacturing efficiency of the superconducting cable.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A superconducting cable manufacturing method, characterized by comprising:

carrying out plate rolling treatment on the plate to obtain a tubular plate;

and arranging a strip-shaped steel material between the two ends of the tubular plate, and welding the strip-shaped steel material and the tubular plate to obtain the superconducting cable.

2. The superconducting cable manufacturing method according to claim 1, wherein the welding of the tubular plate material to obtain the superconducting cable includes:

welding the tubular plate to obtain the welded tubular plate;

and extruding the welded tubular plate to obtain the superconducting cable.

3. A method of manufacturing a superconducting cable according to claim 2, wherein after said welding of said tubular plate material to obtain said welded tubular plate material, the method comprises:

4. A method of manufacturing a superconducting cable according to claim 3, wherein the nondestructive inspection is eddy current inspection.

5. A superconducting cable manufacturing method according to claim 2, wherein said wave-extruding said welded tubular plate material to obtain said superconducting cable comprises:

extruding waves to the welded tubular plate to obtain an inner corrugated pipe;

6. A method of manufacturing a superconducting cable according to claim 5, wherein the evacuation of the accommodation chamber includes:

and filling liquid nitrogen into the low-temperature Dewar pipe.

7. The method for manufacturing a superconducting cable according to claim 5, further comprising, before sleeving the outer bellows on the heat-insulating inner bellows: preparing the outer corrugated pipe.

8. The method of manufacturing a superconducting cable according to claim 1, wherein the preparing the current-carrying conductor and transferring the current-carrying conductor to the sheet material includes:

9. A method of manufacturing a superconducting cable according to claim 8, wherein the flexible former is a metal bellows.

10. A superconducting cable manufacturing method according to claim 1, wherein the welding process is started after a preset time from the start of the winding process.

11. A superconducting cable manufacturing method according to claim 10, wherein a winding speed at the time of winding the sheet is equal to or higher than a welding speed for the tubular sheet.